Sophos Anti-Virus Visual Basic 6 File memoryRDWR integer coercion

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.0	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in Sophos Anti-Virus and classified as critical. Affected is the function memoryRDWR of the component Visual Basic 6 File Handler. The manipulation leads to integer coercion. In addition, an exploit is available. It is recommended to apply a patch to fix this issue.

Detailsinfo

A vulnerability was found in Sophos Anti-Virus (Anti-Malware Software) (the affected version unknown) and classified as critical. This issue affects the function memoryRDWR of the component Visual Basic 6 File Handler. The manipulation with an unknown input leads to a integer coercion vulnerability. Using CWE to declare the problem leads to CWE-192. Integer coercion refers to a set of flaws pertaining to the type casting, extension, or truncation of primitive data types. Impacted is confidentiality, integrity, and availability.

The weakness was presented 11/05/2012 by Tavis Ormandy (@taviso) with Google Security Team as sophailv2.pdf as confirmed document (Full-Disclosure). It is possible to read the advisory at lock.cmpxchg8b.com. The public release was coordinated in cooperation with Sophos. As demonstrated in the initial paper, installing Sophos Antivirus exposes machines to considerable risk. If Sophos do not urgently improve their security posture, their continued deployment causes significant risk to global networks and infrastructure. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details as well as a public exploit are known.

A public exploit has been developed by Tavis Ormandy (@taviso) and been published immediately after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 42 days. During that time the estimated underground price was around $25k-$100k.

Applying a patch is able to eliminate this problem. A possible mitigation has been published even before and not after the disclosure of the vulnerability. In response to early access to the initial report, Sophos did allocate some resources to resolve the issues discussed, however they were cearly ill-equipped to handle the output of one co-operative, non-adversarial security researcher. A sophisticated state-sponsored or highly motivated attacker could devastate the entire Sophos user base with ease.

The vulnerability is also documented in the databases at X-Force (79813), Exploit-DB (22509), SecurityFocus (BID 56401†), OSVDB (87059†) and Secunia (SA51156†). nakedsecurity.sophos.com is providing further details. See VDB-6868, VDB-6865, VDB-6866 and VDB-6870 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Anti-Malware Software

Vendor

Sophos

Name

Anti-Virus

License

commercial

Website

Vendor: https://www.sophos.com/

CPE 2.3info

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CPE 2.2info

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.0

VulDB Base Score: 10.0
VulDB Temp Score: 9.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer coercion
CWE: CWE-192 / CWE-189
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Tavis Ormandy (@taviso)
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

09/10/2012 🔍
10/05/2012 +25 days 🔍
10/22/2012 +17 days 🔍
11/05/2012 +14 days 🔍
11/05/2012 +0 days 🔍
11/05/2012 +0 days 🔍
11/05/2012 +0 days 🔍
11/06/2012 +1 days 🔍
11/06/2012 +0 days 🔍
11/07/2012 +1 days 🔍
11/07/2012 +0 days 🔍
04/15/2018 +1985 days 🔍

Sourcesinfo

Vendor: sophos.com

Advisory: sophailv2.pdf
Researcher: Tavis Ormandy (@taviso)
Organization: Google Security Team
Status: Confirmed
Coordinated: 🔍

GCVE (VulDB): GCVE-100-6863
X-Force: 79813, High Risk
SecurityFocus: 56401
Secunia: 51156 - Sophos Anti-Virus Multiple Vulnerabilities, Highly Critical
OSVDB: 87059
SecurityTracker: 1027725

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍
See also: 🔍

Entryinfo

Created: 11/07/2012 09:33
Updated: 04/15/2018 09:18
Changes: 11/07/2012 09:33 (79), 04/15/2018 09:18 (3)
Complete: 🔍
Cache ID: 216::103